AGW may refer to:

• Anthropogenic global warming, overall warming of Earth's climate caused or produced by humans
• Actual gold weight, a measure used in gold bullion, coin or bar
• Agnew Airport (IATA: AGW), Queensland, Australia
• Access gateway, shorthand for multi-service access gateway (MSAG), a device used in telecommunications
• Argentine Great Western Railway
• Art Gallery of Windsor, Ontario, Canada
• Attorney General of Washington
• Attorney General of Wisconsin
• Attorney General of Wyoming
• Auditor General for Wales
• Avia (airline) (ICAO: AGW), a former airline Johannesburg, South Africa
• Kahua language (ISO 639-3: agw)